How to reformat this pandas multiindex dataframe?

Question

How to turn: Original dataframe

into this: Wanted dataframe

(sorry I don't know how to paste excel table here.)

Been messing around with pandas stack, pivot_table, melt, but can't seem to make it work. I need some ideas. Thanks.

Answer 1

I created excel for the shown screenshot of the sheetfile

---

df = pd.read_excel('PythonExport.xlsx', 
                   header=[0,1,2],index_col=[0,1],
                 )

---

df:

---

x = df.T.swaplevel(0,1).T.stack().stack().reset_index()
x.columns = ['repeat','condition','day','type','length','weight']
x = x.fillna(0)

---

x: